How to deal with a cranky girlfriend?

My girlfriend is a total sweetheart unless she is pmsing. She gets hurt so easily during these days and expect me to have mind reading abilities and sometimes cry for silly things.

I am fine with her doing whatever she wants Because she has a very bad period with cramps and sore boobies and what not! I love her a lot

Is there anything I can do to make her feel better or is it better to leave her alone those days?
How to deal with a cranky girlfriend?
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